Rotary refiner



2 Sheets-Sheet 1 E. P. ARPIN, JR

ROTARY REFINER Filed March 16, 1928 May 28, 1929.

v z-nzsn 57.2"

May 28, 1929.

E. P. ARPIN, JR

ROTARY REFINER Filed March 16, 1928 2 sheets-sheet 2 p .ZZIZ'EIZ 57.2". Edmund jE'Arpz'n J2. a: @W%% Patented May 28, 1929.

' UNITED si -Es EDMUND P. ARPIN, JR, 015 FORT EDWARDS, \VISCQNS I N.

ROTARY REFINER.

Application filed March 16, 1928. Serial No. 262,157.

This invention relates to a rotary refiner for refining wet, fibrous material, such as pulp, paperstock and the like.

In my copending application, entitled R- tary refiner, Serial No. 211,276, filed August 8, 1927, I have described a device of a type similar to that forming the subject of my present application. Mypresent dev ce embodies certain modifications and 1mprove ments in that means are provided for varying the grinding, or refining, pressure lndependent of the speedof revolution of the refining elements. Furthermore, sa1d refining elements are, in the present inventlon, so constructed as to be readily removable for purposes of replacement and the l ke.

It is thereforean importantob ect of thls invention to provide a rotary refiner for re embodying the principles of my invention,

with parts in elevation. 7

Figure 2 is a sectional view taken on line 11-11 of Figure 1.

Figure 3 is a fragmentary enlarged sec- 7 tional view taken on line IIIIII of Figure 1,'with parts in elevation.

1VIV of Figure 3, with parts omitted.

Figure 5 is an enlarged top plan view of a refining element.

Figure 6 is a sectional view taken on l1n VIVI of Figure 5. I

As shown on the drawings:

The reference numeral 1 indicates a casing or vcasting adapt-ed to be mounted upon a hollow base 2 and to house a plurality of re fining elements 3. Said casing 1 is provlded witha lower intake 4: for the admission of wet fibrous material; such as pulp, paper stock, or the like. Said fibrous material enters a cylindrical portion 5 in the intermediatepart of said casing 1- and after subjection to the refining elements 3 passes. out

through a discharge outlet 6 formed in. an upper section 7 bolted to said cylindrical portion 5 and forming a part of the casing-1.

Said casing section 5 is formed with an enlarged cylindrical recess 8 in which is positioned a lining 9 of somesuit-able abrasive material, such as stone, porous iron, or the like. If the lining 9 is of stone, it is prefer- T Ee E-I ably composed of a plurality of segments secured in said recess 8 and presenting a cylindricalabraslve surface for coaction with the refining element-s 3.

A. verticalshaft 10 is suitably journalled in bearings 11 and 12 formed inthe upper section 7 and the lower portion of said casing 1 respectively. Said shaftlO at its lower end 13 is provided with a gear 14 housed within the hollow base 2 and adapted to mesh with a worm gear 15 keyed upon a drive shaft 16. Said drive shaft 16 may be driven by any suitable source of power, such as an electric motor (not shown). At the intake end of the shaft 10, there is mounted thereon an impeller .17 for driving the wet fibrous material under suitable head into the refining chamber. Said impeller 17 is secured to the shaft 10 and is provided with spiral radial arms 19 extendingnto the inner surface of the intermediate casing section 5.

Immediately above the impeller 17 and also secured to said shaft 10,-there is mounted a lower plate 20 having circumferential openings 21, preferably. semi-circular in form and positioned closely adjacent to the ends of each of said impeller blades 19. An upper plate 22 of smaller diameter is similarly secured to the shaft 10 and spaced apart from the lower plate 20 to include between said plates the re fining elements 3. Said refining elements?) are pivotally mounted upon pins 25 extending between said plates20 and 22 for rotation therewith. Each of said refining elements 3 comprises (Figure 6) a, metal backing 26 formed in upper and lower sections, having a common bore 27 to receive one of the pins 25 and provided with separate recesses 28 for receiving stone facing sections 29. The recesses 28 'areso formed as tov providedovetail joints between the metal backings and vthe stone facing material, the stones being cemented or otherwise set in said recesses. Shoulders50 are formed on said metal backings 26'to engage in correspondingrecesses 51 in general conform with the inner'cy'lindrical ustable means are supplied as follows.

face 31 of said lining 9. The forward portion .of each of said arcuate faces 30 curves away as at 32 from the surface 31 in the direction of rotation to form an acute angle therewith. The various refining elements 3 are so positioned relative to the openings 21 that the stock is directed through said openings 21 thereagainst by means of the impeller 17 and deflecting plates-33 suitably positioned with respect to said openings 21. Said deflecting plates 33 direct the incoming fibrous material against the forward faces 32' of said refining elements so as to cause the fibrous material to pass between the .refining surfaces 30' and 31 of the elements 3 and lining 9, respectively. The fibrous material is thus subjected to a rubbing and disintegrating action, the centrifugal force naturally tending to produce a grinding pressure between the respective refining surfaces due to the fact that said refining elements 3 are pivoted eccentrically with respect to their mass. The speed of rotation of the shaft 10 may be adjusted to effect "a certain amount of variation in the refining pressure produced.

In order to provide for a more positive control over the refining pressure, manually ad- The shaft 10 is drilled to provide a bore 34 (Figure 3) extending from the outer free end of said shaft for substantially half its length and threaded at its upper end, as at 35, to re ceive the threaded end 36 of a shaft 37 A wheel 38 is secured upon the outer end of said shaft 37 to enable said shaft to be manually adjusted. Adjacent the bottom of said bore 34 there is formed a transverse slot 39 in which is mounted a cross block 40 capable of limited movement in said slot 39 axially of the shaft 10, as shown in dotted lines in Figure 3. Said block 40 is formed at its ends with depending flanges 41 adapted to enclose an annular collar 42 loosely mounted upon said shaft 10. A helical spring 43 resting upon a lower yoke 44 serves to hold said collar 42 up against the block 40. Said lower yoke 44 is provided with bifurcated bearings 45 in each of which is mounted by means of pivot pins 46 a dog 47. Each of said dogs 47 extends upwardly into a guide groove 48 formed in said collar 42 and is adapted to bear against a bowed metallic spring leaf 49 secured to the lower backing plate26 of each of said refining elements 3, with its free end contacting the upper backing plate. I

It will thus be apparent that by manually turning wheel 38 of the shaft 37 to screw in the shaft, the collar 42 will be caused to spread the dogs 47, with resulting increase in the refining pressure produced between the surfaces 30 and 31 of the refining elements 3 and the abrasive lining 9 respectively. When the wheel 38 is turned in the reverse direction, the pressure againstthe dogs 47 will be released, the coiled spring 43 acting to raise the collar 42 from the dogs. Consequently, the refining pressure will be correspondingly lessened. Other means ofapplying pressure to the collar 42, such as fiuid or hydraulic means, could obviously be substituted in place of the threaded shaft 37.

I am aware that many. changes may be made and numerous details of construction may be varied through a wide range without departing from the principles of this invention and I therefore do not purpose limiting the patent granted hereon, otherwise than necessitated by the prior art.

I claim as my invention:

1. In a rotary refiner, a shell having an in? nor abrasive surface, a central driven shaft, a plurality of refining elements supported from said shaft and rotatable therewith, each of said elements being eccentricallymounted with respect to its mass and adapted to swing as f outwardly against said abrasive surface, dogs bearing against the inner surfaces of said refining elements and adjustable means on said shaft for acting through said dogs to vary the refining pressure between said elements and said surfaces.

2. In a rotary refiner, a shellhaving an innor abrasive surface, a plurality of refining elements mounted within said shell for rotation, each of said elements being pivotally mounted eccentrically with respect to its massand externally adjustable means for creating a positive refining pressure between said ele-.

ments and said abrasive surface in addition to the pressure produced by virtue of centrifugal force.

3. A. rotary refiner,comprising an external casing, an abrasive lining therefor, a driven shaft mounted axially thereof and having a bore extending thereinto from one end thereof, said bore being partially threaded and terminating in a transverse slot, at block mounted in said slot, a screw threaded in said bore and adaptedto bear against said block,

refining elements supported from said shaft for coaction with said abrasive lining and means acting against said elements and cooperating'with said block and screw whereby to vary the refining pressure between said refining elements and said abrasive lining;

4. A rotary refiner, comprising an external casing, an abrasive lining therefor, a driven shaft mounted axially thereof and having a bore extending thereinto from one end thereof, said bore being partially threaded and terminating in a transverse slot, a block 7 mounted in said slot, a screw threaded in said bore and adapted to bear against said block, refining elements supported from said shaft for coaction with said abrasive lining, pivotally mounted dogs supported from said shaft and adapted to bear against said refining elements and a collar mounted upon said shaft for transmitting pressure from said block by operation of said screw to said dogs to vary the refining pressure between said elements and said abraslve llnlng.

5. A rotary refiner, comprising a casing, an

abrasive cylindrical lining therefor, an axially mounted driven shaft,refining elements mounted eccentrically with respect totheir masses and supported'from said shaft for co- 7 action with said abrasive lining and adjustable means associated with said shaft for increasing the bearing pressure between said refining elements and said abrasive lining.

In testimony whereof I have hereunto sub- 7 

